Single vaccine jab appears highly effective against COVID-19, experts say
A single jab of COVID-19 vaccine appears to be highly effective, which could allow better use of scarce supplies and see more people immunized, federal and Quebec health officials said Thursday.
Health authorities in Ottawa said experts were looking at whether one shot of the Pfizer-BioNTech vaccine could be almost as good as the recommended two.
Canada’s deputy chief public health officer, Dr. Howard Njoo, called the data in a new Canadian-authored study compelling.
Writing in the New England Journal of Medicine, two doctors say U.S. data indicate the vaccine to be 92 per cent effective against COVID-19 two weeks after just one dose. Original data suggested a first dose offered about 52 per cent protection.

